Single and double bosonic stimulation of THz emission in polaritonic systems

Abstract

The influence of the surrounding cavity on the efficiency of different types of polaritonic emitters of THz radiation has been analysed. It is demonstrated that THz lasing threshold in realistic structures cannot be achieved without a THz cavity, due to destruction of polaritons via excitonic Mott transition. Even modest values of cavity quality factor (not exceeding 50) provide significant quantum efficiency.

Nonlinear behavior of the emission in the periodic structure of InAs monolayers embedded in a GaAs matrix

“…c, the PL signal at high excitation power reaches the maximum during ∼400 ps, which is much shorter than for the case of low excitation power when the PL intensity becomes highest after ∼900 ps. This behavior is evidence of stimulated scattering of excitons in the ground state . As excitons are bosons, the relaxation of hot excitons can occur via spontaneous and stimulated scattering processes.…”

Multilayer heterostructures for quantum-cascade lasers operating in the terahertz frequency range

“…The Fermi golden rule served to calculate the oscillator strength for transitions between levels in forward-biased multiperiod heterostructures [12]. Figure 3a shows the potential profile for QCL-2 to which an electric field with the strength F = 12.2 kV/cm was applied.…”

Bosonic lasers: The state of the art (Review Article)

“…BCLs would be a valuable alternative to fermionic QCLs as, in principle, they do not require a THz cavity, may be assembled in matrices, and are expected to be easily tunable in a wide spectral range by external electric/magnetic field [26,91,92] or by tuning the depth of the optical parabolic trap. Terahertz cavities, would however further increase efficiency by double bosonic stimulation [93]. Furthermore, it might be possible that condensates at certain steps of the cascade are formed in non-classical states characterized by photon superbunching.…”